DOI: 10.5194/tc-14-4253-2020
论文题名: Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals
作者: Fair Z. ; Flanner M. ; Brunt K.M. ; Amanda Fricker H. ; Gardner A.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 11 起始页码: 4253
结束页码: 4263
语种: 英语
英文关键词: airborne thematic mapper
; depth determination
; glacial lake
; glacier dynamics
; ICESat
; laser method
; meltwater
; satellite altimetry
; seasonality
; snowmelt
; temporal evolution
; Antarctica
; Arctic
; Greenland
英文摘要: Supraglacial lakes and melt ponds occur in the ablation zones of Antarctica and Greenland during the summer months. Detection of lake extent, depth, and temporal evolution is important for understanding glacier dynamics. Previous remote sensing observations of lake depth are limited to estimates from passive satellite imagery, which has inherent uncertainties, and there is little ground truth available. In this study, we use laser altimetry data from the Ice, Cloud, and land Elevation Satellite-2 (ICESat-2) over the Antarctic and Greenland ablation zones and the Airborne Topographic Mapper (ATM) for Hiawatha Glacier (Greenland) to demonstrate retrievals of supraglacial lake depth. Using an algorithm to separate lake surfaces and beds, we present case studies for 12 supraglacial lakes with the ATM lidar and 12 lakes with ICESat-2. Both lidars reliably detect bottom returns for lake beds as deep as 7 m. Lake bed uncertainties for these retrievals are 0.05-0.20 m for ATM and 0.12-0.80 m for ICESat-2, with the highest uncertainties observed for lakes deeper than 4 m. The bimodal nature of lake returns means that high-confidence photons are often insufficient to fully profile lakes, so lower confidence and buffer photons are required to view the lake bed. Despite challenges in automation, the altimeter results are promising, and we expect them to serve as a benchmark for future studies of surface meltwater depths. © 2020 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164454
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States; Nasa Goddard Space Flight Center, Greenbelt, MD, United States; Earth System Science Interdisciplinary Center (ESSIC), University of Maryland, College Park, MD, United States; Scripps Institution of Oceanography, San Diego, CA, United States; Nasa Jet Propulsion Laboratory, Pasadena, CA, United States
Recommended Citation:
Fair Z.,Flanner M.,Brunt K.M.,et al. Using ICESat-2 and Operation IceBridge altimetry for supraglacial lake depth retrievals[J]. Cryosphere,2020-01-01,14(11)